Tribarium dicitrate penta-hydrate, [Ba₃(C₆H₅O₇)₂(H₂O)₄]·H₂O

The crystal structure of tribarium dicitrate penta-hydrate, [Ba₃(C₆H₅O₇)₂(H₂O)₄]·H₂O, has been solved and refined using synchrotron X-ray powder diffraction data, and optimized using density functional techniques. The BaO₉ and BaO₁₀ coordination polyhedra share edges and corners to form a three-dimensional network. All of the active hydrogen atoms act as donors in O-H⋯O hydrogen bonds. Most of the acceptors are carboxyl-ate oxygen atoms, but there are also water⋯water hydrogen bonds. Both of the citrate hydroxyl groups form intra-molecular O-H⋯O hydrogen bonds to terminal carboxyl groups.